I don't like how popular spone balls are nowadays. They're very unnatural in any performance environment. Use cards and coins instead!!! If you whip out sponge balls, the audience is going to think something is up. Our purpose as magicians is not to simply entertain, but to amaze! Sponges are so over-rated! Sorry for coming across as a d-bag, but I wanted to share my views.
I honestly think spongeballs aren't over-rated as they are....cliche.
In the wake of David Blaine and Criss angel, street magic has grown so much. I think the more down to earth an effect is, that is, the more impromptu, realistic, and more in your face it is without the use of props...the more the audience is conditioned to act the way they've seen on t.v. (screaming, yelling, totally freaking out)
I think spongeballs are for the lack of a better term..outdated? It just doesn't match the persona of what you call modern day magic. If it DOES fit your style, then props to your persona, because it definitley clashes with a lot of the newer generation, and to have it work well next to card flourishing or a metal bending act is some skill in itself
Don't throw stones at me